xtensa: fix prefetch in the raw_copy_to_user
'from' is the input buffer, it should be prefetched with prefetch, not prefetchw. Tested-by: NMax Filippov <jcmvbkbc@gmail.com> Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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